<template>
  <div class="my-tab-bar">
  	<div class="tab-item" v-for="(item,index) in arr" :key="index"

        :class="{current:activeIndex === index}"
        @click="clickFn(index,item.componentName)"
    ><!-- 1.3 遍历并且渲染页面   1.4 设置高亮，点击谁就给谁添加高亮-->
      <!-- 图标 -->
      <span class="iconfont" :class="item.iconText"></span>
      <!-- 文字 -->
      <span>{{item.text}}</span>
    </div>
  </div>
</template>

<script>
export default {
  props:{   // 1.2 子接收 并且用validator判定数组的长度在2到5之间才行
    arr:{
      type:Array,
      required:true,
      validator(val){
        return val.length >=2 && val.length <= 5
      }
    }
  },

  data () {
    return {
      activeIndex:0
    }
  },
  methods: {
    clickFn(index,componentName){
      this.activeIndex = index
      this.$emit('changeCom',componentName)  // 1.9 传参
    }
  }
}
</script>

<style lang="less" scoped>
.my-tab-bar {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: white;
  .tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}
    
.current {
  color: #1d7bff;
}
</style>